Stress:strain materials testing instrument



FIG. 1 is a front elevation view of a stress:strain material testinginstrument showing our new design;

FIGS. 2 and 3 are side elevation views thereof;

FIG. 4 is a sectional view, taken at 4--4 of FIG. 1 and enlarged;

FIG. 5 is a perspective view, slightly enlarged;

FIG. 6 is a bottom plan view;

FIG. 7 is a top plan view, slightly enlarged; and,

FIG. 8 is a back elevation view.

The ornamental design for a stress:strain materials testing instrument,as shown.